As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6423 - IAD-ROC - DURING CLIMB-OUT AN EMERGENCY WAS DECLARED AND AIRCRAFT RETURNED TO IAD DUE TO THERE BEING SMOKE IN THE CABIN. AIRCRAFT LANDED AT IAS WITH NO FURTHER INCIDENT. MAINTENANCE DRAINED A SMALL AMOUNT OF OIL FROM THE LEFT COLD AIR UNIT. PERFORMED MAINTENANCE RUNS, BUT COULD NOT DUPLICATE DISCREPANCIES. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)